Big money decisions, honest maths, assumptions shown.
Pick a calculator, enter your own numbers and see when the extra spend pays back. Every assumption sits next to the answer with its source, so you can change it.
I drive km a month; the car costs ₹ more than the petrol one.
CNG pays back in 3 years 10 months
It comes out ₹1.13 lakh ahead after 10 years. The answer changes at 1,191 km a month: drive less than that and petrol is cheaper.
Lucknow fuel prices of 19 Oct 2026; 18 km/L against 26 km/kg; 9% a year interest on the extra price. Example figures.
See the full workingMy electricity bill is about ₹ a month, and a kW system costs ₹ after any subsidy.
Solar pays for itself in 7 years 2 months
It leaves you ₹4.50 lakh ahead after 25 years.
Assumes ₹7 a unit, 4 units per kW a day and no credit for exported units. Example figures.
See the full workingBuy a ₹ home, or rent one for ₹ a month and invest the rest at % a year.
Renting and investing comes out ₹24.50 lakh ahead
After 15 years; ₹10.22 lakh in today's money.
20% down, a 9% loan over 20 years, homes and rent rising 5% a year. Example figures.
See the full workingCalculators
Your car
Your home and loans
Saving, investing and tax
- Should I buy a plot, or put the money in an FD or a mutual fund?What each leaves you after stamp duty, costs and tax
- Where should my monthly saving go: a SIP, PPF or a recurring deposit?What each leaves you after tax, over 15 years or more
- Which income tax regime leaves me more money?Your tax under each for 2026-27, worked out step by step
Mutual funds
- SIP calculator: what will my monthly SIP grow to, after tax?What your SIP is worth, the tax when you sell, and what you keep in today's rupees
- Lumpsum calculator: what will a one-time investment grow to, after tax?What a one-time investment grows to and keeps after tax, with an optional FD comparison
- SWP calculator: how long will my money last if I withdraw every month?How long monthly withdrawals last, the tax on them, and the most you can take
Your power bill
How we work
Assumptions always visible
Every number the answer depends on is listed beside it, with a source and a date. Change any of them and the result updates.
Conservative defaults
When a value is uncertain, the default makes the costlier option work harder to win. Monthly savings, for example, are not assumed to earn interest.
Post-tax and inflation-aware
Where a decision depends on returns or on money years from now, the tools account for tax on returns and for the time value of money, and say how.
No product recommendations
We don’t name or recommend funds, policies, lenders or car models. The tools compare choices; picking a product is up to you.
Guides
- Step-up SIP: what raising your SIP 10% a year doesRaising a ₹10,000 SIP by 10% every year nearly doubles what you keep after 15 years. Most of the gain comes from putting in more, and the rest from giving it longer to grow.
- SWP in retirement: how much can ₹50 lakh pay you each month?An SWP pays you a monthly income from a mutual fund. With the income rising 6% a year, ₹50 lakh at 10% a year can pay about ₹26,400 a month for 25 years. Worked through, with the tax.
- Car loan or cash: what the loan really costsA car loan is worth taking only if your savings earn more than the loan really costs. With a processing fee, that is more than the quoted rate. And a flat rate hides the real one. Worked examples.